How to target two elements with one click? - html

Question

I want to change the background-color of a box after clicking on it and at the same time create another box with pure CSS. I tried it with the target selector. But I only can manage to do one of them asks and not both at the same time.
Here is a DEMO of my try.
/* fonts */
p {
font-size: 10px;
}
#school::after,
#work::after {
font-size: 10px;
content: "Second box";
color: white
}
/* white boxes */
.panel {
height: 50px;
width: 50px;
background-color: white;
border: 1px solid #262626;
position: relative;
}
/* span (100%, 100%) inside the white-boxes */
.panel span {
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
}
/* second-box */
.panel div {
display: none;
}
/* if white-box is targeted, this lets the second-box appear */
.panel div:target {
display: block;
height: 50px;
width: 50px;
background-color: blue;
border: 1px solid black;
border-radius: 4px;
position: absolute;
left: 70px;
}
/* for testing purposes */
.panel:active span {
background-color: black;
}
<p>White Boxes</p>
<div class="panel">
<a href="#school">
<span></span>
</a>
<div id="school"></div>
</div>
<div class="panel">
<a href="#work">
<span></span>
</a>
<div id="work"></div>
</div>

Answer 1

You can modify the presentation of any number of elements using the :target pseudo-class, so long as each one is nested within the element with the id which is :targeted:
/* fonts */
p {
font-size: 10px;
}
#school div::after, #work div::after {
font-size: 10px;
content: "Second box";
color: white
}
/* white boxes */
.panel {
height: 50px;
width: 50px;
background-color: white;
border: 1px solid #262626;
position: relative;
}
/* span (100%, 100%) inside the white-boxes */
.panel span {
position:absolute;
width:100%;
height:100%;
top:0;
left: 0;
}
/* second-box */
.panel a div {
display: none;
}
/* if white-box is targeted, this lets the second-box appear */
.panel a:target div {
display: block;
height: 50px;
width: 50px;
background-color: blue;
border: 1px solid black;
border-radius: 4px;
position: absolute;
left: 70px;
}
/* if white-box is targeted, this gives the box a blue background */
.panel a:target span {
background-color: blue;
}
/* for testing purposes */
.panel:active span {
background-color: black;
}
<p>White Boxes</p>
<div class="panel">
<a href="#school" id="school">
<span></span>
<div></div>
</a>
</div>
<div class="panel">
<a href="#work" id="work">
<span></span>
<div></div>
</a>
</div>

Answer 2

:target is only for one element at same time, because you can't target two anchors at same time. You need javascript or a css trick with :checked
Solution with pure css :checked
http://jsfiddle.net/KNG6n/78/
What I make:
<div class="panel">
<label>
<input type="checkbox">
<div></div>
</label>
</div>
CSS
label {
display:block;
position: relative;
width: 100%;
height: 100%;
}
label input {
visibility: hidden;
}
label input:checked + div {
display: block;
}

Answer 3

I see an answer was accepted already, but will post my solution if anyone else is interested.
I changed the location of the div to be before the link and added a css rule.
new code:
<p>White Boxes</p>
<div class="panel">
<div id="school"></div>
<a href="#school">
<span></span>
</a>
</div>
<div class="panel">
<div id="work"></div>
<a href="#work">
<span></span>
</a>
</div>
CSS added:
.panel div:target+a span{
background-color: black;
}
Demo:
http://jsfiddle.net/KNG6n/81/